What is the meter in poem Sonnets from portuguese XLIII?

The Sonnets from the Portuguese XLIII has a meter of iambic Pentameter. Here is an example with line 5:

How do I love thee? Let me count the ways.

This line consist of ten syllables with alternating stressed and unstressed syllables:

How/do/I/love/thee?/Let/me/count/the/ways.